Carburetor for internal-combustion engines



F. F. STRATTON,

CARBURETOR FOR INTERNAL COMBUiTION ENGINES.

APPLICATION FILED AUG-7, I917.

Patented. Aug. 22, 1922.

3 SHEETSSHEET I.

F. F. STRATTON. CARBURETOR FOR INTERNAL COMBUSTION ENGINES.

APPUCAUON F LED'AUG 7, '1917.

Patented Aug. 22, 1922.

' 3 SHEETSSHEET 2 F. F. STRATTON.

CARBURETOR FOR lNTERNAL COMBUSTION ENGINES.

APPHCATION HLED AUG'T. 1917.

.Patented Aug. 22, 1922.

3 SHEETSSHEET 3.

2. mm wwillw l k 3 l A UNHTELUJ Lena CARBUBETOR FORINTERNAL-COMBUSTION ENGINES.

' Application filed August 7, 1317.

To all whom it may concern Be it known that I, FENTON FREDERICK STnArToN, a subject of the King of Great Britain and Ireland, and a resident of Oak Lodge, Park Hill Road, East Croydon, Surrey, England, have invented new and useful improvements in Carburetors for Internal-Combustion Engines, of which the following isthe specification.

This invention relates to improvements in carburetors for internal combustion engines.

The object of the invention isto provide improved means to effectively employ a heavier liquid fuel such as paraffin conjointly with 'a lighter liquid fuel such as petrol.

The invention comprehends' aplurality of main nozzles, a pilot nozzle, a plurality of air inlets, means including-an automatic piston valve for opening and closing the main nozzles and the air portsin succession during the rise and fall ofsaid automatic valve, in combination with means to feedthe pilot or starting nozzle only'with petrol or lighter liquid fuel, and the main nozzle with a heavier liquid fuel such as paraflin, said last mentioned means including'two float chambers, one for the lighter fuel and one for t'he'heavier liquid fuel, themain nozzles being brought successively into operation.

An important feature of the invention also resides in'the special location and connectionof the air supp'lypipe at the bottom of the carburetors, whereby a simple, practical construction is provided, enabling'the air intake pipe to be turned to adaptthe same to suit different arrangements of the hot air supply as encountered in different types of cars. l

The invention, with other objects and advantages thereof, and the particular construction, combination andarrangement of parts comprising the same, will be understood fromthe hereinafter contained detail description, when considered in connection with the accompanying drawings. forming part hereof, and illustrating one embodiment of the invention.

In the drawings Figure 1 is a sectional elevation through the carburetor and the two float chambers.

Figure 2 is a'sectional plan of the carburetor.

Figure 3 is a section at right angles to that shown in Fig. 1.

Figure 4 is a vertical section of the main carburetor chamber without the valve.

Specification of Letters Patent.

Patented Aug. 22, Serial No. 184,952.

Figure 5 is an extension showing the respective positions of the three air ports.

Referring to a detail description of the drawings, wherein like reference characters designate corresponding parts throughout the several views, 1 designates the central cylindrical nozzle chamber having integrally formed therewith a second cylinder 2 located above it and of larger diameter, this second cylinder 2 having secured thereto the outlet portion ofthe casing 3, in which latter is mounted the throttle valve D. The piston valve E, which is shown formed of two diameters, is adapted to slide vertically in the cylinders 1 and 2, the upper or larger part or diameter of the valve E sliding in the larger diameter of the casing 2, and the lower portion of the valve or smaller diame ter E in the casing portion 1. The cylinders l and 2 are rigidlysecuredtogetherby bolts 4 and 5 tothe base Z of the carburetor.

The valve E is provided with lugs or bosses (see Figs. 3 and 4:) having openings therein, and fitting within the said openings are the tubular caps I, J, K. The caps I, J, K are adapted to fit loosely over the three main nozzles J', K, I, when the piston valve is in its lowermost position. The nozzles are of equal length, but the capsfl, J, K, as shown are of varying lengths so that as the valve rises the nozzle J is first uncovered (after the pilot nozzle L later referred to) and then in succession the nozzles Provision is made for the adjustment of the operative lengths of the caps to raise or lower the position of the caps relatively to the automatic valve. For this purpose each cap is provided with a plurality of holes S, and a pin S adapted to be engaged with one of the holes S and to rest against the upper face of the piston valve E. N, N, N designate air ports arranged'to be opened in succession, that is to say, that the port N which supplies the nozzle J "is uncovered first and the cap of the nozzle Jis first lifted. As the'valve continues to lift the port N isopcned and the nozzle K commences'to operate, and finally the port N is opened and the nozzle 1 operates, the nozzles with their respective ports being successively brought into operation,'the lowest'air port N, however, being never completely closed, so that when starting, air enters the central choke tube L through the holes L The paraflin or heavy liquid fuel floatchamber F is rigidly secured to the base plate 1 of the carburetor on the one side, and the iioat chamber W for the lighter liquid fuel is similarly connected on the'other side of the carburetor. Conveniently, the fuel channels F and W are formed as one con tinuous passage or channel extending directly across and through the carburetor base plate, and a screw Y is fitted in the base plate to form a partition to completely separate the channels 1*" and N. The tic 3 ed chamber W, by the channel N, thus ijeeds the central nozzle only, this jet l being the starting or pilot nozzle. The float feed chamber F containing paraliin, or the like. supplies the nozzle J by the channel F, and

also the nozzles l1. and l, by the channels F F (see Fig. 2) which branch from the channel F.

The air supply to the carburetor which is preferablyheated in any suitable way, entore the same by the inlet pipe 4.. The intake pipe A is connected with the base of the carburetor and extends laterally therefrom, as shown, and an adjustable swivel connection between'said intake pipe A. and the base of the carburetor being provided so that the inlet pipe A may be turned around to meet the position of the heated air supply pipe Figs. 2 and 3) in the base Z to the annular chamber B surrounding the central mixing chamber.

Instarting, air enters the center choke tube L through the holes L? provided For each main nozzle in the conical base ot the choke tube L. risjthe valve rises and portsmopen, the suction on the tube l diminishes until :all of the ports are opened when the supply fromthe petrol nozzle l. becomes a minimum. On the other hand, as the ports progressively open, the main noz zles J K, Isuccessively supply parallin or heavier liquid fuel by the respective nozzles in SUCCGSSlOIL- Thus, in a very convenient and simple manner the pilot nozzle is fed by petrol or the like only, while the three main nozzles controlled by the said caps are ted by paratfin or the like only, a complete separation being effected between the two supplies.

The construction has the particular advantage that when the throttle is nearly closed by means of its connection to the pedal lever or the like, (not shown), as for exam The pipeA is shown formed with pie, when the vehicle upon which the carburetor is fitted, is suddenly stopped or slowed down in traific, or otherwise, the ieavier liquid fuel or paraflin is automatically cut" oil and petrol alone fed by the pilot nozzle, thus avoiding the smoking, which nearly always arises under such conditions when parafiin is employed. On the other hand, as Soon as the throttle is opened the suction on the pilot nozzle decreases and the mai supply again comes progressively and successively from the paraiiin nozzles.

W hat do claim as my invention and desire to secure by Letters Patent is l. in a carburetor, a casing having a plurality 05f air ports arranged in stepped relation, a multiplicity of nozzles including a main nozzle and a pilot nozzle, an automatic piston valve reciprocable in the casing and operated by the engine suction, means connccted with the piston valve for opening and closing the air ports in the casing and the main nozzles in succession, said casing having a base plate formed with a straight channel eiztending through and, across the same, a float chamber for the heavier :luel connect: ed with one end of passage, a float chamber for the lighter iuel connected with the other end of thepassage, the starting nozzle and one of the main nozzles being located in line with said main channel and in communication therewith, means for closing the main channel between said main nozzle and the starting nozzle, and branch channels leading from the main nozzle side of the main channel to the other main nozzles.

2. In a carburetor, casing having a cen tral mixing chamber, an air chamber surrounding the mixing chamber, a multiplicity of nozzles and. air .portsleading into the mixing chamber, an automatic piston valve reciprocablein the casing andoperated by the engine suction, means connectedwith the piston valve for opening and closing-the air ports in the casing and the multiplicity of nozzles in succession, and anair inlet. connection at the base of the carburetor com municating with the coniientrically disposed air chamber, said air intake comprising an air intake pipe having a portion extending laterally of the carburetor casing, andmeans providing an adjustable swiveling oint connection between the inner end of said intake pipe andthe base of the carburetor casing.

FENTON'FREDERICK STRATTON.

. Witnesses l. D. Roo'rs, CATHERINE A. CARLISLE. 

